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What does this vb statement mean: private declare submarine "kernel 32" (bvval dw millions as long).
The declaration refers to the private function Sleep (), and the parameters are long integer parameters (milliseconds). Lib "kernel32" indicates that the function refers to a function provided by kernel32.dll. Kernel32.dll is one of the four core libraries of windows.

It is used to delay n milliseconds. The function did not return a value.